Question about Dell Dimension 8400 power supply ** FREE ** (D8400SATA300W24PINB) Power Supply

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My Dell Dimension 8400 has for years often no started on poer-on but gone into hyper drive with a fan. Can only stop it by unplugging power cable. If I pick up the box and shake it, it will then work. Now also getting "dreaded blue sceen errors". Restarting from them produces the steriod damaged fan. Is it power suppy? Is mother-board damage now occurring?

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Nope... That more likely ram and hard drive damage.. Change your memory and if it still goes bsod then change the harddrive

Posted on Jun 06, 2010

  • jco44002 Jun 12, 2010

    I changed the RAM as advised and upgraded to 2G at the same time. It's been 5 days and all problems have disappeared. Goodonyamate!

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Can not get computer to power back up no lights on front o rear just little light on mother board have dell 8400


Bad Power Supply, sscorbett.

Usually you have enough power to light LED lights, (Like the harddrive activity LED light for add-in cards, that you see on the motherboard), and spin fans, but Not enough power to turn the Processor on.

Dell Support >Dimension 8400 > Service Manual

http://support.dell.com/support/edocs/systems/dim8400/SM/index.htm

Technical Overview > System Board Components

http://support.dell.com/support/edocs/systems/dim8400/SM/techov.htm#wp1052739

harddrive activity light for add-in cards (SCSI LED)

The Dimension 8400 comes with an ATX style of Power Supply, that has a maximum rated Wattage of 250 Watts.
1) ALL of the LED lights combined use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts
3) A typical Processor can use 51 to 125 Watts.

Your Power Supply just has enough power to light that LED light.
Weak voltage power rail.
Replace the Power Supply.

[ There are three power rails inside that SMPS.
Switched-Mode Power Supply.

1) The 3.3 Volt power rail
2) The 5 Volt power rail
3) The 12 Volt power rail ]

The ATX form factor for a Power Supply refers to the size, and shape of the case, for one.
Approximately 6 inches Wide, 5.5 inches Long, and 3-1/2 inches Tall.
The ATX power supply case in the Dimension 8400 however, is shorter in length.
It is 4 inches Long. (Depth)

Not an advertisement for the website, nor manufacturer.
Reference for the case size, and power cables needed,

http://www.cputopia.com/hp-400w-dell-dimension-8400.html

Scroll down to see the connectors of the various power cables needed.

You may have a Power Supply with these dimensions, and needed power cables, in an unused computer.
Perhaps someone has upgraded to a better computer, and has an unused computer that you can temporarily borrow the Power Supply for a test unit.

Make sure it has at least 250 Watts (Maximum rated wattage), plus,

1) 20-pin ATX main power cable. (Or a 20 + 4-pin ATX main power cable)

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

[ 20 + 4-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20plus4 ]

2) 4-pin ATX +12 Volt power cable

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

Plus the various power cables needed for the Harddrive, optical drive/s, and computer case fan/s, if it/they do not connect to the motherboard.

Oct 21, 2010 | Dell Dimension 8400 power supply ** FREE...

1 Answer

CPU Fan sounds like a jet and computer won't start


It sounds more like the hard drive, the fan has nothing to do with your computer booting up. If the hard drive is starting to go bad it will not boot up, that's what it sounds like your computer is doing. I recommend checking out the hard drive and replacing it.

Jul 02, 2010 | Dell (Fan Only) M/N AFC0912DE, DC12V,...

2 Answers

No Power


i hope you completely unplug all power cables from the outlet before inserting the new memory. if not, your mainboard may be damaged already.

Nov 09, 2009 | Dell DimensionTM 8400 PC Desktop

1 Answer

Dell dimension 8400 will not start.


no man try to take out the modem ( last pci slot on the botom of the board) and see if you have any luck if not you going to need a new motherboard thanks and good luck

Oct 11, 2009 | Dell Dimension 8400 PC Desktop

2 Answers

Dell Dimension 8400 Start up Fan Noise


Might be a hard drive issue. I had the same problem with one of My desktops. I replaced the hard drive and it worked fine.

Jul 01, 2009 | Dell Dimension 8400 PC Desktop

3 Answers

Dell 8400 runaway fan no diagnostic lights and very ocassionally it starts normally


Which fan?, the cpu fan or the cpu fan?

Most Dell pc come with a below average power supply. I recommend replacing your power supply with a better one. Do a search on Google for a good replacement power supply for you Dell 8400.

Please rate response.

Feb 17, 2009 | Dell Dimension 8400 PC Desktop

1 Answer

Dell Dimension 8400 power supply


Hi,
It not a common problem. The problem that you are facing is is beacuse of faulty motherboard. The blinking amber is caused , becasue the motherboard is not able to distribute the power signal to the devices . You can follow the link below to trouleshoot the problem if you are comfortable in opening the computer chassis

http://tinyurl.com/8mkpnm


Thanks
Proton

Jan 20, 2009 | Dell Dimension 8400 power supply ** FREE...

2 Answers

Dell Dimension power problem


There are several different solutions for this as posted at this Forum.

http://www.tomshardware.com/forum/51352-2-dell-dimension-8400-wont-boot

1) A lot of people have just removed the Jumper for the CMOS and turned the Power back on and back off and replaced the jumper and/or removed the battery.

2) Several people have reseated the Memory and after booting back up it worked.

3) A few had to replace the Mother Board and CPU but in this instance they had to also replace the Case because the Dell case wasn't really fit for the heat of from the CPU.

4) I had the exact same problem and luckily replacing the Power Supply fixed this for me. I had to cut out the back of the Dell case for the toggle on/off switch but when I tested the old Power Supply it was only getting 5amps and this was causing the Amber/Orange/Yellow light to constantly flash.

I hope this helps!

Jan 20, 2009 | Dell Dimension 8400 power supply ** FREE...

4 Answers

Woes with Dell


If the power light is steady amber, a device might be malfunctioning or incorrectly installed.

Disconect fan , see if it starts.

Jan 13, 2008 | Dell Dimension 8400 PC Desktop

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